The Canadian Security Intelligence Service advised the office of Public Safety Minister Steven Blaney of its concerns during a secret September briefing.

CSIS flagged well-known warnings of the persistent menace posed by terrorist groups al-Qaida, Hezbollah and the more violent and radical Islamic State of Iraq and the Levant, or ISIL, say notes obtained through the Access to Information Act.

But under the heading Domestic Extremism, the spy service also underscored what might be the flip side of that coin — the recent development "of a Canadian online anti-Islam movement, similar to ones in Europe."

CSIS characterized it as an "ongoing risk, particularly as its proponents advocate violence."

The Sept. 18 briefing for Blaney's office came a little more than a month before soldiers were killed in Canadian attacks just two days apart — murders committed by young men that authorities say were motivated by Islamic extremism.

Shortly after the killings, there was vandalism of mosques in Ottawa and Cold Lake, Alta., threats against the B.C. Muslim Association, and a general increase in reports of public bullying and harassment of Muslims.

However, CSIS is likely more interested in the kind of anti-immigrant, anti-Islam sentiment that has taken root in some parts of northern Europe, even among the middle class, said Lorne Dawson, a University of Waterloo sociology professor and co-director of the Canadian Network for Research on Terrorism, Security and Society.

"They're just not used to dealing with immigrants at all, let alone immigrants that are quite different," Dawson said of Europe. "We have a much longer track record of immigration in general — waves and waves of immigrants that have come for decades."

Dawson suspects CSIS is motivated by the horrific July 2011 slaughter of 77 people in Norway by Anders Behring Breivik, who penned a manifesto outlining his far-right ideology, including an extreme anti-Muslim outlook.

"In Europe, it tends to attract violent individuals. So if (there's) any chance it's starting to take wings in Canada, then you can see why they're concerned," he said. "I suspect they're just seeking due diligence to be on top of this at the earliest possible moment in light of Breivik."

A Norwegian official briefed CSIS shortly before the release of an inquiry report that found the Scandinavian country's security services could have prevented Breivik's attack.

CSIS spokeswoman Tahera Mufti did not respond to requests for comment.

The government's anti-terrorism bill, to be scrutinized at a Commons committee starting next week, would give the RCMP power to seek a judge’s order to remove extremist propaganda from websites.

National security threats are not confined to Canadian borders, the CSIS presentation notes warn.

"International developments have a considerable impact on Canada's interests."

CSIS faces a challenging investigative environment in which the rapid movement of people and modern communications technology has "extended the reach" of those who pose a threat and has increased the ease and speed with which they can act, the notes add.

"Co-operation with domestic and foreign partners is critical, including reliable access to information."

Police secure an area around Parliament Hill in Ottawa on Oct. 22, 2014.

A soldier standing guard at the National War Memorial was shot by an unknown gunman and people reported hearing gunfire inside the halls of Parliament.

Paramedics and police pull a shooting victim away from the Canadian War Memorial in Ottawa on Wednesday Oct.22, 2014. A Canadian soldier standing guard at the National War Memorial in Ottawa has been shot by an unknown gunman and there are reports of gunfire inside the halls of Parliament.

An RCMP intervention team runs next to a Parliament building in Ottawa Wednesday Oct.22, 2014. A Canadian soldier standing guard at the National War Memorial in Ottawa has been shot by an unknown gunman and there are reports of gunfire inside the halls of Parliament.

RCMP intervention team members walk past a gate on Parliament hill in Ottawa.

A soldier, police and paramedics tend to a soldier shot at the National Memorial near Parliament Hill in Ottawa on Wednesday Oct.22, 2014.

Police secure an area around Parliament Hill in Ottawa on Wednesday Oct.22, 2014. A gunman opened fire at the National War Memorial, wounding a soldier, then moved to nearby Parliament Hill and wounded a security guard before he was shot, reportedly by Parliament's sergeant-at-arms.

Police secure an area around Parliament Hill in Ottawa on Wednesday Oct.22, 2014. A gunman opened fire at the National War Memorial, wounding a soldier, then moved to nearby Parliament Hill and wounded a security guard before he was shot, reportedly by Parliament's sergeant-at-arms.

Police and paramedics tend to a soldier shot at the National Memorial near Parliament Hill in Ottawa on Wednesday Oct.22, 2014. Police are expanding a perimeter around Parliament Hill after a gunman opened fire at the National War Memorial, wounding a soldier, then moved to nearby Parliament Hill where he was reportedly shot by Parliament's sergeant-at-arms after wounding a security guard.

Civilians leave a secured area around Parliament Hill in Ottawa on Wednesday Oct.22, 2014. Police are expanding a perimeter around Parliament Hill after a gunman opened fire at the National War Memorial, wounding a soldier, then moved to nearby Parliament Hill where he was reportedly shot by Parliament's sergeant-at-arms after wounding a security guard.The Hill remains under lockdown amid reports there may be two to three shooters, according to a senior official locked in the Official Opposition Leaders' office.

Police teams move towards Centre Block at Parliament Hill in Ottawa on on Wednesday, Oct. 22, 2014. A gunman opened fire at the National War Memorial, wounding a soldier, then moved to nearby Parliament Hill and wounded a security guard before he was shot, reportedly by Parliament's sergeant-at-arms.

An Ottawa police office draws her weapon in Ottawa on Wednesday Oct.22, 2014. Police are expanding a security perimeter in the heart of the national capital after a gunman opened fire and wounded a soldier at the National War Memorial before injuring a security guard on Parliament Hill, where he was reportedly shot dead by Parliament's sergeant-at-arms.

An Ottawa police officer runs with his weapon drawn in Ottawa on Wednesday Oct.22, 2014.Police are expanding a security perimeter in the heart of the national capital after a gunman opened fire and wounded a soldier at the National War Memorial before injuring a security guard on Parliament Hill, where he was reportedly shot dead by Parliament's sergeant-at-arms.

People under lockdown look out of an office building near Parliament Hill in Ottawa on Wednesday, Oct. 22, 2014. A gunman opened fire at the National War Memorial, wounding a soldier, then moved to nearby Parliament Hill and wounded a security guard before he was shot, reportedly by Parliament's sergeant-at-arms.

Police search cars and pedestrians as they leave the Alexandra Bridge and enter Gatineau, Que. near the Parliament Buildings during an active shooter situation in Ottawa on Wednesday, October 22, 2014.

Police officers take cover in Ottawa on Wednesday Oct.22, 2014.Police are expanding a security perimeter in the heart of the national capital after a gunman opened fire and wounded a soldier at the National War Memorial before injuring a security guard on Parliament Hill, where he was reportedly shot dead by Parliament's sergeant-at-arms.

Traiffic is stopped below Parliament Hill during a lock down in the downtown core of Ottawa after a member of the Canadian Armed Forces was shot in Ottawa, Wednesday October 22, 2014.